[TRNSYS-users] Change the Simulation Time

[王洋]

Dear all,

          I set the simulation time as 18 h, there is an occupant from 8 h
to 18 h. But I only need the simulation curve from 8 to 18 h, I don't need
the curve from 0 to 8 h. I tried some methods but it doesn't work. E.g. 1) I
set the Simulation start time and stop time as 8 h and 18 h separately, but
the simulation results of some parameters is different from from 0 to 18 h,
moreover, the effect is bad.
2) I set the time as 8640 h + 18 h, i.e. the second year from 0 to 18 h, but
I still can't obtain the curve of 8 h to 18 h  of the second year.

         Please give me some advices!

         Many thanks a lot in advance!

         Br.

      wang

2011/9/5 <trnsys-users-request at cae.wisc.edu>

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> Today's Topics:
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>   1. External shading factor (Damien Gondre)
>
>
> ---------- 已转发邮件 ----------
> From: Damien Gondre <dgondre.etamine at gmail.com>
> To: trnsys-users at cae.wisc.edu
> Date: Mon, 5 Sep 2011 18:26:36 +0200
> Subject: [TRNSYS-users] External shading factor
> Hello,
>
> I have a question about “external shading factor” defined in TRNBuild.
> Does this factor apply to beam radiation or total radiation?
> In others words if I define an external shading factor “Eshad”, a view
> factor to sky “VFS”, and a window g-value “gw” and if my window receives
> beam radiation “Ib” and diffuse radiation “Id”, does the total radiation
> “It” that is transmitted through the window is:
>
> 1)    It = (Ib*(1-Eshad) + VFS*Id) * gw (?)
> Or
> 2)    It = (Ib * (1-Eshad) + Id*(1-Eshad)*VFS) * gw (?)
> Or
> 3)    It = (Ib+Id) * (1-Eshad) * gw (?)
>
> Equations 1) and 2) make sense to me but I don’t know which one is correct
> (if one is actually correct). 3) would be more surprising (because the VFS
> doesn’t apply in this case).
>
> I looked at the user guide and the Type 56 mathematical description but I
> couldn’t find any answer. I also looked at the Trnsys-users archives and
> even if external shading factors have been discussed several times I didn’t
> find the answer to my question.
>
> Thanks,
>
> Damien Gondre.
>
>
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